Lock mechanism



United States Patent LOCK MECHANISM ,Pedro del Pozo Villalba, Madrid, Spain Application August s, 1953, serial No. 372,578 Claims priority, application SpainAugust 23, 1952 3 Claims. c1. 70-134 The present invention relates to a lock mechanism and, more particularly, to a lock having an interfitting lock housing and keeper. H

. .The art of safety locks is ancient and many attempts have been made to provide locking means of maximum security, including many types of secret combination locks. However, all known locks are vulnerable to lever action. Levers will apply such a strong force that even heavy steel and complicated combination locks will break under it. Levers force locks open because the bolt mounting in conventional locks is such that the bolt will give under the pressure of the lever action.

In accordance with the present invention, the bolt of the lock is mounted in a housing constituted by a casing attached to a door and a jamb plate attached to the door jamb, the bolt being slidable in the housing from an open into a closed position and being interlocked with the jamb plate in the closed position. -Such a lock is not accessible to lever action and cannot be pried open by such action.

The lock mechanism will be described in connection with a preferred embodiment illustrated in the single figure of the accompanying drawing, which shows a sec tion of the lock attached to a door and door jamb.

The casing of the lock housing consists of ajwall portion 1 for attaching the casing to the door P, two parallel side walls 2 and 4, an end Wall 3 and another wall portion 5 parallel to but laterally and longitudinally spaced from wall portion 1. The two side walls connect the end wall with respective ones of said wall portions, side wall 2 connecting wall portion 1 with the 'end wall 3 being longer than side wall 4 connecting the end wall with wall portion 5. A projection 6 is attached to wall portion 1 and is substantially of the same length as the lateral spacing between wall portions 1 and 5. An opening A separates wall portion 1 with its projection 6 from wall portion 5.

A convention tubular lock 13 is fixedly mounted in the casing walls 1 and 3 and carries bolt 7 to be slidably reciprocated by key 14 in a manner well known per se.

The casing is so mounted on the door P, which is to be locked, so that its opening A projects beyond the door and over the door jamb M. The jamb plate 10 is attached to the jamb of the door in alignment with the wall portion 1 of the casing when the door and door jamb are in alignment, i. e. when the door is closed. The jamb plate has a hook-like projection extending into opening A and consisting of hook elements 11 and 11 which are perpendicular to each other. Hook element 11' must be sufficiently short to enter freely into opening A when bolt 7 is disengaged.

Bolt 7 has an end or stop plate 9 at one end thereof adjacent the lock 13 and a hook-like end projection 8, 8 at its other end. Hook-like projections 11, 11 and 8, 8 interlock, as shown in the drawing, when the door is closed in the direction of arrow BC and the key 14 is turned to reciprocate the bolt into its locked position.

7 Patented Feb. 24, 1959 The operation of the lock mechanism is exceedingly simple, as will appear from the following description thereof:

When door P carrying the casing 1, 2, 3, 4, 5 is closed in the direction of arrow BC so that the door and door jamb M are in alignment, the look-like projection 11, 11 of the jamb plate 10 enters into opening A of the bolt housing, wall portions 1 and 10 of the housing being in alignment. Key 14 is now turned to slide the bolt into the illustrated position wherein its hook-like projection 8, 8 interlocks with the hook-like projection of the jamb plate. When it is desired to open the lock, the key is turned in the opposite direction to reciprocate the bolt 7 out of engagement with the hook-like projection of the jamb plate, which will enablethe door P to be swung open freely in the direction of arrow BC.

Theend plate 9 of the bolt will aid in balancing and guiding the bolt in its reciprocating motion and other conventional guide means may be provided for this pur pose.

It will be readily apparent that it is practically impossible to force this lock mechanism with a lever or crowbar. When a crowbar is inserted between the door and the door jamb and pressure is applied thereto in an effort to force the lock open, lock parts 10 and 5, 8 and 11' and end wall 3 are pressed together with a force increasing with the applied lever pressure, thus preventing opening of the lock.

I claim:

1. A lock mechanism comprising a casing adapted to be attached to a door, said casing consisting of an end wall, a wall portion for attaching the casing to the door, another wall portion parallel to but laterally and longitudinally spaced from the first-named wall portion, two parallel side walls connecting the end wall with respective ones of said wall portions, the side wall connecting the first-named wall portion to the end wall being longer than the side wall connecting the last-named wall portion to the end wall, a projection attached to the first-named wall portion and being of substantially the same length as the lateral spacing between said wall portions, an opening being formed between said wall portion projection and the last-named wall portion and said opening being adapted to be located along the edge of the door; a jamb plate in alignment with said first-named wall portion and adapted to be attached to the jamb of said door, said plate being provided with a hook-like projection adapted to enter said opening of the casing when the door is in alignment with the door jamb; and a bolt having a'hook-like end projection slidably mounted in said casing, the hook-like end projection being adapted to interlock with said hook-like projection of the jamb plate.

2. A lock mechanism comprising a rectangular casing adapted to be attached to a door and consisting of an end wall, a first wall portion parallel to the end wall for attaching the casing to the door, a second wall portion parallel to the end wall, two parallel side walls at right angles to the end wall and connecting the end wall with respective ones of said wall portions, the side wall connecting the first wall portion being longer than the side wall connecting the second wall portion of the end wall, whereby the second wall portion is inwardly oif-set from the first wall portion, a projection arranged at the end of the first wall portion at right angle thereto and in alignment with the edge of the door, the end of the projection being in alignment with the second wall portion, and an opening being formed between said projec-- tion and the second wall portion; a jamb plate adjacent the second wall portion and in alignment with the first wall portion, said plate being adapted to be attached to the jamb of said door, a hook member mounted on said plate and adapted. to enter. said casing, opening when the door is in alignment with the door jamb; and a bolt slidably mounted in said casing for reciprocal movement therein, said bolt being-provided atone end thereof with a hook. adapted to interlock with the hook on said jamb plate, said hook of the jamb plate being free to enter the. casing opening when the bolt is reciprocated out of engagement by a key means.

3. In a lock mechanism which comprises a laterally reciprocable lock bolt engageable by a keeper: a rectangular casing adapted to be attached to a door and consisting of an end wall, a first wall portion parallel to the end wall for attaching the casing, to the door, a second wall portion parallel to the end wall, two parallel side walls at right angles tothe end wall and connecting the end wall with respective ones of said wall portions, the side wall connecting the first Wall portion being longer than the side wall connecting the second wall portion to the end wall, whereby the second wall portion is-inwardly ofi-set from the first wall portion, a projection arranged at the end of the first wall portion at right angles thereto and in alignment with the edge of the 1 door, the end of the projection being in alignment with the second wall portion, said projection and the second Wall portion defining an opening therebteweema jamb plate adjacent the second wall portion and in alignment with the first wall portion, said plate being adapted to be attached to the jamb of the door, a hook mounted on said plate and adapted to enter the casing opening when the door is in alignment with the door jamb; and a hook mounted at one end of" saidlock bolt and adapted to interlock with the hook of the jamb plate, the bolt being slidably mounted in the casing for reciprocal movement therein and the hook of the jamb plate being free to enter the casing, opening when the bolt is reciprocated out of engagen'ient'therewith.

References Cited in the file of this patent UNITED STATES PATENTS 55,047 Bohannan May 29, 1866 1,263,349 Holtzman Apr. 16, 1918 1,462,828 Rixson July 24, 1923 vFOREIGN PATENTS 1,379 Great Britain Jan. 27, 1890 240,592 Germany Nov. 10, 1911; 316,855 Great Britain 1930 391,552 Great Britain May 4, 1933 

